As for the option of the in-dash sat-nav in the first place, I think the reason they cost what they cost (and their updates) is quite simple - people still option them (whether for the convenience, or just so they have everything, it doesn't really matter), so why would the cost go down? The cost will only go down when manufacturers find that people are not optioning their sat-nav's due to price. Personally, I don't see that happening any time soon - after all, when you've already spend $40, $50, $60K+ on a car, another couple grand may not seem that much. Pragmatists will use their TomTom/iPhone/etc, those who must have it all will still tick the option box.
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